Quality, stainless steel digital vernier calipers with 4-function measurement: internal, external, depth and step. Thumb wheel fine adjustment and zero setting at any position. Accurate to 0.01mm/0.0005″. Quality, stainless steel digital vernier calipers with 4-function measurement: internal, external, depth and step. Thumb wheel fine adjustment and zero setting at any position. Accurate to 0.01mm/0.0005″.